When my kids teethed it could be like cold symptoms too, however the fever should NOT go over 100. Despite what Jana said, I don't need science to tell me what I learned with two teething. They both got runny noses, excess slobber, low grade fever, irratible, not wanting to eat,with all the moms I know those symptoms are all pretty prevelant during teething.
The coughing could be due to the mucus too. I never heard of watery eyes, that sounds like allergies or a cold coming on, I don't know when you can give Benadryl, maybe call your Dr as that will dry up the nose and help reduce the mucus if it is allergies or a cold.
I know that sometimes that a lot of times the excess mucus, slobber can lead to an ear infection too, fluid getting trapped, which sounds like he could be having symptoms of. Most ear infections will clear up by themeselves but they are miserable.
If he isn't better within a few days or fever increases, I would take him in, however try teething tablets for temporary relief, motrin at night and see if that helps.
I agree with the Hyland tablets, Teething tablets were a godsend during the day for us.
I know too if the runny nose is clear fluid that can be due to teething. My son slobbered like crazy for months, he would drench the front of his clothes daily with his teething.
Hugs! If the fever gets worse I would worry, as they say 100.8 isn't that high in babies.
Good luck.